According to the excerpt given from Flannery O'Connor's "The Life You Save May Be Your Own.", there is a monologue where the narrator compares the human body to a house because it doesn't go anywhere.
The second simile comes when the narrator compares the spirit to an automobile because it is always on the move.
Therefore, the excerpt contains two similes.
P. S A simile is a figure of speech that compares two dissimilar things using 'like' or 'as'
